The Lehigh Tunnel on the Pennsylvania Turnpike (Interstate 476) will be turned into single-lane patterns at night and two-way traffic daily from 8 p.m. to 6 a.m., Sunday through Thursdayfor tunnel inspection and water line maintenance.

The Lehigh Tunnel is located at milepost A70-A71 between the Lehigh Valley, Exit 56, and Mahoning Valley, Exit 74, interchanges.Turnpike maintenance crews will stop traffic for no more than 15 minutes in both directions to set up a crossover pattern directing all traffic into the northbound tunnel before the start of work each day.Message boards will be used to update motorists of any changes to the schedule caused by inclement weather or unforeseen traffic conditions. If the work is delayed, it will take place on the next available day.